共50条信息
如图,\(AB/\!/\)平面\(\alpha /\!/\)平面\(\beta \),过\(A\),\(B\)的直线\(m\),\(n\)分别交\(\alpha \)、\(\beta \)于\(C\),\(E\)和\(D\),\(F\),若\(AC=2\),\(CE=3\),\(BF=4\),则\(BD\)的长为____________.
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